Will Photoshop CS5 (and other CS5 apps) work with El Capitan?
Make a fresh Clone of your system on an extra hard drive, (make sure it is big enough).
Install El Capitan on the clone you just made. Make sure to do any updates.
Test it by booting your Mac from the clone and making sure that El Capitan works.
Do not run your email program.
If CS5 is already installed just work with it to make sure it's working correctly. If so you can then upgrade your Mac to El Cap.
This should do the trick.
BrianThis message has been edited. Last edited by: Brian Stone,
I've had no problem with CS5 Gordon, and I'm up to High Sierra. The only thing I've run into was the need to update Java with each system upgrade. Brian's suggestion is always a good plan.
I generally do system upgrades on my MacBook Air before upgrading my iMac, to test all of my software, but I also make a full, bootable backup of the MacBook first, just in case.
"I really need a new tagline"
—P M Evans
Thanks, Phyllis and Brian. I'll follow your advice.